Rapid wet-chemical oxidative activation of graphite felt electrodes for vanadium redox flow batteries
| Autor: | Jan Büttner, Severin Vierrath, Siham Ouardi, Susanne Koch, Brian Shanahan, Anna Fischer, Khaled Seteiz, Philipp A. Heizmann, Matthias Breitwieser |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Thermal oxidation X-ray photoelectron spectroscopy Materials science General Chemical Engineering Vanadium chemistry.chemical_element thermochemische Prozesse General Chemistry Electrolyte Wasserstofftechnologie carbon-graphite Redox electrodes Contact angle vanadium redox flow (VRF) chemistry Chemical engineering hydrogen Electrode Graphite Wasserstofftechnologie und elektrischer Energiespeicher |
| Zdroj: | RSC advances. 11(51) |
| ISSN: | 2046-2069 |
| Popis: | To boost the performance of vanadium redox flow batteries, modification of the classically used felt electrodes is required to enable higher cycling performance and longer life cycles. Alternative approaches to the standard thermal oxidation procedure such as wet chemical oxidation are promising to reduce the thermal budget and thus the cost of the activation procedure. In this work we report a rapid 1 hour activation procedure in an acidified KMnO4 solution. We show that the reported modification process of the felt electrodes results in an increase in surface area, density of oxygenated surface functionalities as well as electrolyte wettability, as demonstrated by N2-physisorption, XPS, Raman spectroscopy as well as contact angle measurements. The activation process enables battery cycling at remarkably high current densities up to 400 mA cm−2. Stable cycling at 400 mA cm−2 over 30 cycles confirms promising stability of the reported activation procedure. |
| Databáze: | OpenAIRE |
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